## Type: SB-POSIX:FILE-DESCRIPTOR
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> A FIXNUM designating a native file descriptor.
> 
> SB-SYS:MAKE-FD-STREAM can be used to construct a FILE-STREAM associated with a
> native file descriptor.
> 
> Note that mixing I/O operations on a FILE-STREAM with operations directly on its
> descriptor may produce unexpected results if the stream is buffered.